摘要: 1.不为空 select * from table where id <> ""; select * from table where id != ""; select * from table where is not null; 2.为空 select * from table where id 阅读全文
posted @ 2019-05-23 09:02 努力努力再努力zZ 阅读(44747) 评论(1) 推荐(0) 编辑